Raspberry Pi port, piCore-15.0 is available!
- AMDGPU DC display support for GCN 1.0 "Southern Islands" graphics processors. AMDGPU DC for GCN 1.0 was one of the lingering missing items that remained for potentially enabling AMDGPU support by default for GCN 1.0/1.1 era hardware in place of the Radeon DRM driver. The last apparent blocker though is the lack of analog output support with AMDGPU DC and so for that no default change has been made. Those with these aging Radeon HD 7000 series graphics cards and other select GCN 1.0/1.1 products can boot their kernel with "amdgpu.cik_support=1 amdgpu.si_support=1 radeon.cik_support=0 radeon.si_support=0" to enjoy the AMDGPU kernel driver by default that also means working Vulkan support, possible performance improvements, and just enjoying the more modern code-base. https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.10-Feature-Recap
What motherboard do you have? Do you have a separate video card, or are you using the APU? If so, which video connectors are you using for your monitors?